Control of default RS-232 pin levels?

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  - 1
    - input as well output through DeviceIoControl Hello, I want to send an ioctl to muy device driver where i want to send a buffer of information to the device driver and then get some information back from the driver , is this possible ? Can i supply input and output bufer in DeviceIoControl at the same time? when i try to do this , which of the passed user buffers will be given to my driver's ioctl processor in the following: IRP->AssociatedIrp.SystemBuffer what is the correct way to do this? regards Taha Tag: Control of default RS-232 pin levels? Tag: 48867
  - 2
    - Compile Errors when using usbioctl.h I am trying to compile a file that uses one of the pre-defined IOCTL codes in usbioctl.h. I am getting build errors (C2220 and C4200) because this file has some data type definitions with zero-length arrays. For example, the Data array in the typed below is zero length, and causes such an error. typedef struct _USB_DESCRIPTOR_REQUEST { ULONG ConnectionIndex; struct { UCHAR bmRequest; UCHAR bRequest; USHORT wValue; USHORT wIndex; USHORT wLength; } SetupPacket; UCHAR Data[0]; } USB_DESCRIPTOR_REQUEST, *PUSB_DESCRIPTOR_REQUEST; I also notice a disturbing pragma statement near the beginning of the file: #pragma message ("warning: using obsolete header file usbioctl.h") It confuses me further that I don't see this message in my console window when I do my build. This version of the header shipped with the latest DDK, so I'm confused. Can anyone shed some light on this? FYI: I'm doing a checked build. Thanks in advance for the help, Dennis Tag: Control of default RS-232 pin levels? Tag: 48857
  - 3
    - USB WDM driver working on 2000, XP and 2003, but not 98 Hi all, as the title says: I have developed an USB driver which works fine on all platforms but 98 (I don't know about Me: not tested). Is there any DDK tool that can check for Windows compatibility? Thanks! Tag: Control of default RS-232 pin levels? Tag: 48854
  - 4
    - ndisprot sample code and Win98SE/ME Hi, Does any one know how to build the ndisprot for Win98SE/ME ? I use the WinXP SP1 DDK (select the win 2K build environment) to build the ndisprot.sys. But the ndisprot.inf could not used to install ndisprot.sys on win98SE/ME. Any suggestion ? Tag: Control of default RS-232 pin levels? Tag: 48852
  - 5
    - iSCSI Target Are there any references to writing an iSCSI target driver for Windows? I understand that Microsoft provides an iSCSI client driver, but we wanted to develop our own iSCSI targe driver for remote devices. -ken P.S. Any references available for developing the iSCSI target in user space instead of in a driver? That way we could write a service that could handle the iSCSI commands; just need to be able to register as an iSCSI target and receive (and intepret) the protocol). Tag: Control of default RS-232 pin levels? Tag: 48849
  - 6
    - Help me about USB keyboard upper filter driver. I wrote a keybaord upper filter driver for WinXP(like systeminternal.com 's Ctrl2cap),it had work correctly,such as notice my APP. I only want to get the multimedia key's code and change the multimedia key's behavior,but I found if I use USB keyboard ,I can't get any information when I press the multimedia keys and power management keys.But if I use PS/2 keyboard,I can get every key's make code and break code,Why? In IRP_MJ_READ I use: IoSetCompletionRoutine( Irp, ReadComplete, DeviceObject, TRUE, TRUE, TRUE ); NTSTATUS ReadComplete( IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp,IN PVOID Context ) { PIO_STACK_LOCATION IrpSp; PKEYBOARD_INPUT_DATA KeyData; int numKeys, i; PAGED_CODE(); // Request completed - look at the result. IrpSp = IoGetCurrentIrpStackLocation( Irp ); if( NT_SUCCESS( Irp->IoStatus.Status ) ) { KeyData = Irp->AssociatedIrp.SystemBuffer; numKeys = Irp->IoStatus.Information / sizeof(KEYBOARD_INPUT_DATA); for( i = 0; i < numKeys; i++ ) { if((KeyData[i].Flags == 2 || KeyData[i].Flags==4) && KeyData[i].MakeCode==0x6D) //Press Media Sel Key { KeyCode=KeyData[i].MakeCode;//store the make code for params to notice my APP KeSetEvent(pEvent, EVENT_INCREMENT, FALSE);//notice my APP } } } // Mark the Irp pending if required if( Irp->PendingReturned ) { IoMarkIrpPending( Irp ); } return Irp->IoStatus.Status; } Please help me. Tag: Control of default RS-232 pin levels? Tag: 48845
  - 7
    - Erratum in Walter Oney's book "Programming the MS Windows Driver Model" 2nd Ed. Hi folks, Just a quick check to see whether anyone else has found this, and agrees that it's just a typo: I've been developing a multifunction driver in accordance with the principles laid out in Walter's book, which I am finding to be a very clear and useful volume. However, there does appear to be a small error in it.... In Chapter 11, where it discusses handling of PnP requests dependent on whether the IRP concerns the FDO or PDO, Table 11-1 indicates that the "succeed" action should be taken for IRP_MN_QUERY_DEVICE_TEXT when handled for a PDO. When I tried this with the verifier running, a bugcheck ensued: WDM DRIVER ERROR: [xxxxxx.sys @ 0xF052BF70] Caller has changed the status field of an IRP it does not understand (Irp = 820EAF48 ). IRP_MJ_PNP.IRP_MN_QUERY_DEVICE_TEXT(Bogus) I then took the time to install the examples that come with the book, and noticed that the MULFUNC example actually performs the "ignore" action, so I'm assuming that this is just a typo in the book? MH. Tag: Control of default RS-232 pin levels? Tag: 48844
  - 8
    - Closing the handle A few weeks ago I brought up my IFD handler with the then version of firmware we had produced and noted that the driver's Create/Close/and cleanup functions would all be called during system boot, and before any Smart card app could be called. No surprises, but I did at one point suspect that the asynchronous nature of Open/Close was causing a serialization blue screen. That proved to be something else, but I well remember the fact that Creat, Close, and Cleanup were all invoked by Windows Smartcard services during thast early testing. Now, several weeks and many fixes later, I note that Create only is now called. Close and Cleanup never get invoked until I shutdown the system. However, this affects Standby/Hibernate since the IFD handler fails the Standby/Hibernate POWER IRP because it has an open handle. One of the firmware fixes involved correcting the ATR. Does the ATR have ANYTHING to do with setting a state that Windows Smartcard services will not close it's handle to the reader, as evidenced in earlier testing? Gary G. Little Tag: Control of default RS-232 pin levels? Tag: 48843
  - 9
    - filter driver ? Hello guys, My name is Lior. I need your help with a project I am currently working on. I need to catch sound traveling from the modems speaker phone to the sound board (SB). the sound is not traveling with wave-in/out commands but in a certain driver level, cause all of the sound when a conversation is started, is directed to the SB automatically (even when I track the number of current active streams, with my SB monitor program, I don't see any change in the number of streams when the call is beginning, meaning it is all done in a lower level, so I think). As I said, I need to capture that sound so I can decide what to do with it - transfer it somewhere else or let it pass me to the SB. I understand that I need to develop a filter driver, after reading much on KS I still don't know which layer a filter driver I need. Is it a lower level filter driver (below the functional driver) ? or an upper filter driver (above the functional driver) ? Please help. p.s I also need to simulate a mic connected to the SB. Meaning fooling the SB that he gets sound from the mic-in jack when actually I am transmitting to him sound from a socket. Can that be done in the same filter driver ?? Thanks in advance, Lior Knaany. Tag: Control of default RS-232 pin levels? Tag: 48842
  - 10
    - Problem while changing USB Configuration : First Data not received !!! Hi, My device has 1 USB configuration with 1 interface which has 3 alternate settings as follow: Alternate setting 0 : EP 1 : Interrupt IN EP 2 : Isochronous IN Alternate setting 1 : EP 1 : Interrupt IN EP 2 : Isochronous OUT EP 3 : Bulk OUT EP 4 : Bulk IN Alternate setting 2 EP 1 : Interrupt IN EP 2 : Isochronous IN EP 3 : Bulk OUT EP 4 : Bulk IN My driver correcly Select Interface/AtlernateSettings each time it needs, but after each alternate setting change (between Alt 1 and Alt 2), the first Interrupt (or Bulk IN) Pipe Read URB does not receive data from USBD (whereas my Physical USB Spy detect correct frames). Then all goes well (I receive Interrupt IN and/or Bulk IN data). It also seems that the USB Bus driver does not forward (or detect) USB data after selecting a new interface/alternateSetting couple. Note 1 : My driver pools IN pipes (except Bulk IN) using IRP reuse Note 2 : For the First SelectConfiguration/interface, the problem does not occur ! Does seomeone encountered this kind of problem ? Thansk by advance Sebastien Tag: Control of default RS-232 pin levels? Tag: 48839
  - 11
    - share memory in kernel mode and user mode how can I share the kernel mode memory in user mode and vice versa in a video driver dll. Do I need to create the memory using any particular function or so ??? Tag: Control of default RS-232 pin levels? Tag: 48837
  - 12
    - read data from other driver problem this is my source code for function called from thread creating by driver. This function read data from other driver using ZwReadFile function. My problem is that ZwReadFunction always returns STATUS_INVALID_PARAMETER. I try evryfing for 2 days, but i can't find bug. Please help me NTSTATUS status; HANDLE SvanRTHandle; PBYTE buffor[SVAN_RT_READ_BUFFER_COUNT]; IO_STATUS_BLOCK io_status[SVAN_RT_READ_BUFFER_COUNT]; UNICODE_STRING ReadEventName; UNICODE_STRING ReadEventNumber; ULONG size; LONG i, tmp; ULONG j; PBYTE buf; //handle used to read data from SvanRTDriver PVOID event[2]; PVOID revent[SVAN_RT_READ_BUFFER_COUNT + 1]; HANDLE h_ReadComplete[SVAN_RT_READ_BUFFER_COUNT]; ............... RtlInitUnicodeString(&USvanRTDeviceName,SvanRTDeviceName); InitializeObjectAttributes(&ObjectAttributes, &USvanRTDeviceName, OBJ_KERNEL_HANDLE /*| OBJ_EXCLUSIVE*/ , NULL, NULL); DPF_ENTER(("READ - OpenFileForRead")); status = ZwCreateFile(&SvanRTHandle, FILE_READ_DATA, &ObjectAttributes ,io_status, 0, FILE_ATTRIBUTE_NORMAL, 0, FILE_OPEN_IF, FILE_NON_DIRECTORY_FILE, NULL,0); if(!NT_SUCCESS(status)) { DPF_ENTER(("READ - SvanRTDriver open error 0x%x",status)); KeSetEvent(&SvanRTThredEnd, 0, FALSE); PsTerminateSystemThread(STATUS_SUCCESS); return status; } ReadEventName.Length = 0; ReadEventName.MaximumLength = 100; ReadEventName.Buffer = (PWSTR)ExAllocatePool(NonPagedPool, 200); ReadEventNumber.Length = 0; ReadEventNumber.MaximumLength = 100; ReadEventNumber.Buffer = (PWSTR)ExAllocatePool(NonPagedPool, 200); for(i = 0; i < SVAN_RT_READ_BUFFER_COUNT; i++) { ReadEventName.Buffer[0]=0; ReadEventName.Buffer[1]=0; ReadEventName.Length = 0; RtlAppendUnicodeToString(&ReadEventName,L"\\BaseNamedObjects\\SvRTEv"); RtlIntegerToUnicodeString(i,10,&ReadEventNumber); RtlAppendUnicodeStringToString(&ReadEventName,&ReadEventNumber); DPF_ENTER(("READ - Create read end notification event %S,%d",ReadEventName.Buffer ,i)); revent[i + 1] = IoCreateNotificationEvent(&ReadEventName, h_ReadComplete + i); buffor[i] = (PBYTE)ExAllocatePool(NonPagedPool, read_buffor_size); DPF_ENTER(("READ - send read request %d - event object address %p handle 0x%x bufor %p read_buffor_size %d" ,i ,revent [i + 1],h_ReadComplete[i],buffor[i],read_buffor_size)); status = ZwReadFile(SvanRTHandle, h_ReadComplete[i], NULL, NULL, io_status + i, buffor[i], read_buffor_size, NULL, NULL); DPF_ENTER(("READ - Status = 0x%x",status)); } ps. I need acychronus data read. Radek Tag: Control of default RS-232 pin levels? Tag: 48836
  - 13
    - How to read my private devmode in OEMStartDoc ? Hello, I need to send data in OEMStartDoc(..) in ddihhok.cpp. This data are in my private devmode. They are set by my User Interface plug-in. How can I read this data in OEMStartDoc ? Thanks Benoit Tag: Control of default RS-232 pin levels? Tag: 48835
  - 14
    - some question for Audio capture in the TESTCAP Hi All my hardwave can capture sound form microphome to PCM Format, I need to add audio support in the Video Capture Driver. 1 how to show a graph like *microphome-->Capture in the Graph Edit?? just like TvAudio Filter!! Can I write a custom Filter like this and how to do thos ?? or I can define a TOPOLOGY for it?? 2 should I need to support Audio propertys ?? which one I need to support ?? KSPROPERTY_AUDDECOUT_MODES or KSPROPERTY_AUDDECOUT_CUR_MODE?? 3 when I use this sample code CComPtr<IBaseFilter> ppf; hr = pBuilder->SetOutputFileName(&MEDIASUBTYPE_PCM, L"C:\\Example.Wav", &ppf, NULL); It retrun error code 0x80040154L REGDB_E_CLASSNOTREG,how do I Slove this?? thanks a lot Tag: Control of default RS-232 pin levels? Tag: 48834
  - 15
    - Probelm with Selecting Alt Interface in USB Hi all, I'm trying to get USB Alt Interface. When i tried i'm getting BlueScreen error. Plz give me your suggesstion. The Code: interfaceDescriptor = USBD_ParseConfigurationDescriptorEx( ConfigurationDescriptor, ConfigurationDescriptor, 1, 5, -1,-1,-1); if (!interfaceDescriptor) { return STATUS_UNSUCCESSFUL; } siz = GET_SELECT_INTERFACE_REQUEST_SIZE(interfaceDescriptor->bNumEndpoints); urb = ExAllocatePool(NonPagedPool, siz); if (!urb) return STATUS_NO_MEMORY; urb->UrbHeader.Function = URB_FUNCTION_SELECT_INTERFACE; urb->UrbHeader.Length = (USHORT)siz; urb->UrbSelectInterface.ConfigurationHandle = urb->UrbSelectConfiguration.ConfigurationHandle; urb->UrbSelectInterface.Interface.Length = sizeof(struct _USBD_INTERFACE_INFORMATION); if (interfaceDescriptor->bNumEndpoints > 1) { urb->UrbSelectInterface.Interface.Length +=(interfaceDescriptor->bNumEndpoints-1)* sizeof(struct _USBD_PIPE_INFORMATION); } urb->UrbSelectInterface.Interface.InterfaceNumber = 1; urb->UrbSelectInterface.Interface.AlternateSetting = 5; urb->UrbSelectInterface.Interface.Class = interfaceDescriptor->bInterfaceClass; urb->UrbSelectInterface.Interface.SubClass = interfaceDescriptor->bInterfaceSubClass; urb->UrbSelectInterface.Interface.Protocol = interfaceDescriptor->bInterfaceProtocol; urb->UrbSelectInterface.Interface.NumberOfPipes = interfaceDescriptor->bNumEndpoints; Interface = &urb->UrbSelectConfiguration.Interface; ( ==> Interface is not stored all information from &urb->UrbSelectConfiguration.Interface.) for (i=0; i<urb->UrbSelectInterface.Interface.NumberOfPipes; i++) { // perform pipe initialization here // set the transfer size and any pipe flags we use // USBD sets the rest of the Interface struct members urb->UrbSelectInterface.Interface.Pipes[i].MaximumTransferSize = USBD_DEFAULT_MAXIMUM_TRANSFER_SIZE; } ntStatus = CallUSBD(DeviceObject, urb); (Bluescreen Error is coming) After calling above function., immediately Bluescreen is appeared. Blue Scereen Info: 0x0000008E : (0xC0000005, 0xF81AF878,0xF4C81A00, 0x00000000) USBPORT.SYS ==> Address 0xF81AF878 Base At 0xF8195000, DataStamp 0x3F04CF17 Could you plz any one tell me why this problem is happening. How should i resolve this problem. -- Thanks & Regards, NagarajuS Tag: Control of default RS-232 pin levels? Tag: 48833
  - 16
    - Network Bridge Hi i want to bridge two NIC cards for which i have NDIS 5.1 miniport drivers with me. i am not finding any clue of how to programmatically bridge the two drivers. i am using Windows XP as the platform. please give some direction. thanks & regards vinay Tag: Control of default RS-232 pin levels? Tag: 48832
  - 17
    - getting errors while building hclinet applcn Hi, When trying to build the example hclient given in the DDK on windows2K, i get the following messages in the log file created. The hclient is not created. Where am i going wrong. Is this code specific to WinXP BUILD: Computing Include file dependencies: BUILD: Examining e:\winddk\3790\src\wdm\hid\hclient directory for files to compile. Compiling e:\winddk\3790\src\wdm\hid\hclient directory ******************** 'nmake.exe /c BUILDMSG=Stop. -i NTTEST= UMTEST= NOLINK=1 NOPASS0=1 386=1' BUILDMSG: Warning : The sample "E:\WINDDK\3790\src\wdm\hid\hclient" is not valid for the current OS target. Linking e:\winddk\3790\src\wdm\hid\hclient directory ******************** 'nmake.exe /c BUILDMSG=Stop. -i LINKONLY=1 NOPASS0=1 NTTEST= UMTEST= 386=1' Narendra Tag: Control of default RS-232 pin levels? Tag: 48825
  - 18
    - HELP, 2k EngModifySurface Links with WIN32K.sys Hi All, In 2K usermode printer driver, I am trying to use EngModifySurface. Only this call uses win32k.lib, this finally gets linked with WIN32K.sys, which is kernel mode GDI component. Even GDI32.DLL supports lot of ENG functions, why this is moved to WIN32K.sys? for me any 2k driver built with this call causes not load the UI. Also fails to print from the winword. Any one noticed similar problem ? Please help on this. Waiting for your reply. -- With Thanks & Regards, Shrinidhi.Kulkarni 5732293x5215 Tag: Control of default RS-232 pin levels? Tag: 48824
  - 19
    - sony display driver HI I have a sony gdm 4011p monitor (20") that's showing up as a plug&play monitor - allowing me only 1280x1024. What could I do to get the maximum resolution (e.g. 1600x1200)? Thanks Henrique Tag: Control of default RS-232 pin levels? Tag: 48808
  - 20
    - Serial Out from Kernel Mode Hi All, I need to pass the debug statements from a kernel driver thru the serial port to a different machine. I have tried the following code: fileName.Buffer = NULL; fileName.Length = 0; fileName.MaximumLength = sizeof(DEFAULT_LOG_FILE_NAME) + sizeof(UNICODE_NULL); fileName.Buffer = (PWSTR)ExAllocatePool(PagedPool, fileName.MaximumLength); if (!fileName.Buffer) { //DD(NULL,DDE,"LogMessage: FAIL. ExAllocatePool Failed.\n"); KdPrint((DRIVERNAME " LogMessage: FAIL. ExAllocatePool Failed")); return FALSE; } RtlZeroMemory(fileName.Buffer, fileName.MaximumLength); status = RtlAppendUnicodeToString(&fileName, (PWSTR)DEFAULT_LOG_FILE_NAME); InitializeObjectAttributes (&objectAttributes, (PUNICODE_STRING)&fileName, OBJ_CASE_INSENSITIVE|OBJ_KERNEL_HANDLE, NULL, NULL ); status = ZwCreateFile( &FileHandle, //FILE_APPEND_DATA, FILE_WRITE_DATA, &objectAttributes, &IoStatus, 0, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_WRITE, FILE_OPEN_IF, FILE_SYNCHRONOUS_IO_NONALERT, NULL, 0 ); ZwWriteFile( FileHandle, NULL, NULL, NULL, &IoStatus, buf, Length, NULL, NULL ); to do this... But More often than not I dont get the Serial out messages. At some times I do get a few Serial outs on the remote machine but there seems to be some baudrate problem. I Also tried this: PDEVICE_OBJECT SerialDevice; PFILE_OBJECT FileObject; UNICODE_STRING uszDevName; WCHAR szDevName[] = L"\\Device\\Serial0"; RtlInitUnicodeString (&uszDevName, szDevName); status = IoGetDeviceObjectPointer (&uszDevName, SYNCHRONIZE|GENERIC_READ|GENERIC_WRITE, &FileObject, &SerialDevice); if (!NT_SUCCESS(status)) { KdPrint((DRIVERNAME " IoGetDeviceObjectPointer:Error cant open File ")); return FALSE; } // if else { KdPrint((DRIVERNAME " Bingo Got it")); } But cant open handle this way. Can anyone suggest what is a best way to do this. Sunil. Tag: Control of default RS-232 pin levels? Tag: 48807
  - 21
    - manually loading a pnp driver is there a way for me to manually loading a driver into the kerenel and get it's DriverEntry function called (without getting it's AddDevice called ofcourse) ? Tag: Control of default RS-232 pin levels? Tag: 48799
  - 22
    - Re: Power Management in PASSTHRU Alireza Dabagh [MS] wrote: > BTW, although sending a packet from a device/protocol edge that is in low > power state is not desired, it is not fatal. Thanks Ali! This was the missing piece of information. > "Eric Brueggemann" <eric.brueggemann@gmail.com> wrote in message > news:cd7gp2$an0@odah37.prod.google.com... > > 1. Does NDIS serialize PNP events with respect to send/receive paths? > > 2. If not, is it a requirement that a packet does not leave the driver > > from an edge that is in low power? > > > > If the answers are 1)no and 2)yes, as I suspect they are, then I > > believe we have a bug in the PASSTHRU driver. So as I now understand, the answer to 2 is no and, hence, there is no bug. The confusion came from the apparent effort in PASSTHRU to guarantee no packets leave low-power edges. So, when I saw a violation of this, I assumed it was a bug. IMHO, a clarifying comment in the code would be helpful to future newcomers. Thanks, Eric Alireza Dabagh [MS] wrote: > Assuming the answers to the questions are yes and no, what is the bug? are > you referring to lack of protection for MPDeviceState and PTDeviceState > variables? > > BTW, although sending a packet from a device/protocol edge that is in low > power state is not desired, it is not fatal. > > -ali > > -- > This posting is provided "AS IS" with no warranties, and confers no rights. > > "Eric Brueggemann" <eric.brueggemann@gmail.com> wrote in message > news:cd7gp2$an0@odah37.prod.google.com... > > Thanks Maxim. I think I found the thread you're referring to. There > > certainly was good information there. I now know, among other things, > > that MPHalt can be called without PtUnbind ever being called. > > > > Unfortunately, however, it didn't address my issue. I believe my > > question boils down to this: > > 1. Does NDIS serialize PNP events with respect to send/receive paths? > > 2. If not, is it a requirement that a packet does not leave the driver > > from an edge that is in low power? > > > > If the answers are 1)no and 2)yes, as I suspect they are, then I > > believe we have a bug in the PASSTHRU driver. > > > > As always, I am very grateful for any insight anybody may have on this. > > > > Cheers, > > > > Eric > > > > Tag: Control of default RS-232 pin levels? Tag: 48795
  - 23
    - Printer Driver (NT) Print Dialog Properties User interface Are there any samples one can use to create the user interface dll that is presented to a user when the user presses the Properties button on a printer setup dialog (Windows NT) - without it - the users can't set paper size etc.... Thanks Tag: Control of default RS-232 pin levels? Tag: 48783
  - 24
    - Notifications to a DLL I am new to driver development, so my question might be a bit naive. The Situation: I'm developing a USB-based device. A user can connect or disconnect one or more of these devices at any time. I provide a dll to interface between a Windows application and my kernel-mode driver (under construction). Either I or my customer customer will create his/her own Windows app, in their favorite programming environment. The Problem: I'd like to provide callback functions in my dll that will execute whenever a device is connected or disconnected. I can see that there is an SDK Platform function RegisterDeviceNotification that allows user code to register for a callback to a window or service. But I don't have either in my dll. This does not therefore seem to meet my needs. I also see that the IO Manager exports the IoRegisterPlugPlayNotification for drivers. It accepts a callback function argument. The Questions: Can I use the IoRegisterPlugPlayNotification function and locate the callback function be in my (user mode) dll? Or, is there a way to use the RegisterDeviceNotification user-mode function with my dll? Or, is there a better way? Tag: Control of default RS-232 pin levels? Tag: 48779
  - 25
    - high speed isoch => why number of packets has to be a multiple of 8 ? Hello, The hepl file for isousb sample driver in XP ddk says the following: " The number of packets sent down with each Irp/Urb pair should be a multiple of 8. " i have also tried and when it is not a multiple of 8 , packets do not go through . however i do not understnad the reason . Is this limit defined in any way by the USB 2.0 specification? If yes , what part of the spec? If not , then what is the reason for this limitation? could somebody please clarify this? thanks in advance regards Taha Tag: Control of default RS-232 pin levels? Tag: 48778
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  - 1
    - Problem Modifing the NDIS packet Hi All, I am trying to modify the NDIS packet. I want to redirect the packet from destined for 172.10.10.10 to 172.10.10.10. steps taken to modify the packets. 1. Modify the Destination IP address. 2. Calculate the Checksum. 3. Modify the Destination MAC address. 4. Send the packet. I have used both Network stacking and own NDIS packets. When i tested my code, it worked on One Ethernet Adapter and it did not work on another adapters. I do not know why. When i captured the packet with Etherreal, it shows that the Checksum is 0 at the destination. Everything else is fine. I checked the IP address, MAC address, then are updated. I am calculating the right checksum and i made sure i am updating the checksum after i modified the packet. I am not sure, when Checksum became 0. I do not know, if Miniport driver made it 0. Is that the posibility? if yes then why? Is my checksum wrong? I am attaching the code to calculate checksum here. Thanks in advance for your help. Regards Rajesh /* ************************************************************************** Function: FltIPSumCalculation Description: Calculate the 16 bit IP sum. *************************************************************************** */ USHORT FltIPSumCalculation(USHORT len, PUSHORT pbuf) { ULONG sum=0; while(len > 1){ sum += *pbuf++; len -= sizeof(USHORT); } if(len) sum += *(UCHAR*)pbuf; sum = (sum >> 16) + (sum & 0xffff); sum += (sum >> 16); // one's complement the result sum = ~sum; return ((USHORT) sum); } Tag: Control of default RS-232 pin levels? Tag: 48773
  - 2
    - halftone settings in GDIINFO Hello printer driver gurus, I am currently working on a virtual CGM printer driver using the msplot example as reference. Since CGM is a device independent format it can handle RGB 24bits (8bits per value). To which value should I set the ulHTOutputFormat field of the GDIINFO structure? The msplot example shows that it is set to HT_FORMAT_4BPP, why? Thanks in advance, Theo Landman Tag: Control of default RS-232 pin levels? Tag: 48772
  - 3
    - ndis usb hi, i am writing a ndis usb driver(actually putting the sample codes ndiswdm and bulkusb together). it seems that the driver could send/receive the packet properly if it ignored the mac address of the incoming packet. But I just wonder how to determine the physical mac address of the target device in the initialization stage since the usb controller does not really have one??? Thanks. Tag: Control of default RS-232 pin levels? Tag: 48769
  - 4
    - _vsnwprintf May this a stupid question By using dumpbin utility,I found out that wdm.lib exports functions like __vsnprintf __strupr __strset __stricmp __snwprintf __snprintf but not _vsnwprintf as required by ntstrsafe.h when used as inline .... Why is that ? Tag: Control of default RS-232 pin levels? Tag: 48759
  - 5
    - Read file from driver - asychronicaly I try to read asynchronicaly data from file. I use ZwReadFile function. But as event to wait this function take HANDLE to event (not Evenmt Object). How to cteate handle to event object. In news arciwum on google i found sample that use ZwCreateEvent Function. But in W2003 DDK I can't find this function. Can I read my file asynchronicaly ??? Radek Michalski Tag: Control of default RS-232 pin levels? Tag: 48758
  - 6
    - Size of NON-Paged Memory??? Hi all, For the common buffer master/slave DMA driver, the "AllocateCommonBuffer" is used to allocate non-paged contiguous memory. Does anyone know the maximum size of non-paged contiguous memory could be allocated by "AllocateCommonbuffer"? If there are 10 or more devices in the PC, what is the maximum size of accumulated non-page contiguous memory? Clliman Tag: Control of default RS-232 pin levels? Tag: 48755
  - 7
    - How to play sound in Avssamp?? Hi I have try to play sound in Avssamp,I uncomment some code when audio is required,but it still cann't not run ,where is the place that I need to modify?? in the KsNodeDescriptors and KsConnections also has some code is marked,should I remove it?? Second: may I change avssamp.dat to any WAV file that will be fine ?? Thanks a lot Tag: Control of default RS-232 pin levels? Tag: 48750
  - 8
    - about SCSI command Hi, I may post this message to a wrong place but I think I can get the answer here. I tried to send a SCSI command, Request Sense, to a SCSI disk logic unit, but there are two buffers, one is the data buffer and the other is the sense data buffer. Which buffer should be used for this command? I red in the document of SPC-2 and is still puzzled at it. It seems that the sense buffer is used only for autosense situation. As a result, I think I should use the data buffer. However, I could not make sure. Please help me. Thanks! Tag: Control of default RS-232 pin levels? Tag: 48740
  - 9
    - Where can I download a Drivers-Finder? Where can I download a Drivers-Finder? Is that possible to download a Drivers-Finder software to probe drivers (most them are: motherboard chipset, sound, display, network) from a machine, after formatting this machine, i can reload the drivers i kept from the Drivers-Finder program? any answer or suggestion is appreciated. mark msgmark@hotmail.com Tag: Control of default RS-232 pin levels? Tag: 48739
  - 10
    - Malformed TCP packets I have an application that uses overlapped sockets. I run two instances of the application on different PCs; one instance connects to another, then both instances exchange some data. I am having troubles with certain PCs, which send out malformed TCP packets with wrong TCP checksums or IP headers partially overwritten by user data. The problem happens with Win2k SP3 machines, and SP4 seems to help. Now I have an XP SP1 machine (A) and XP SP2 machine (B). When A connects to B, all works fine. When B connects to A (i.e. A is listening), then some TCP packets coming out of A are malformed. When two instances of the appliction are running on A, all is fine. Other XP SP1 and 2003 machines work fine. So it must be something wrong with the machine A. Even if I did something wrong in my user-mode program, this woudn't affect the packet headers, would it? Is it possible to get the list of all the drivers in the TCP stack? I would then compare the stacks on A and B to see if there's any difference. Any other suggestions? Thanks. Tag: Control of default RS-232 pin levels? Tag: 48736
  - 11
    - Wireless OID and WPA question Dears I use PCAUSA for wireless OIDs , but it cannot support Windows User Mode . Do you know if latest PCAUSA W32N50 can support User Mode or other good API ? Might I write WPA functions without Funk or Meetinghouse IM driver ? Thanks a lot .. Tag: Control of default RS-232 pin levels? Tag: 48734
  - 12
    - NT and 9x reference code hello. As far as I know, developers can use the template in windows 2000 DDK plotter driver to create an OEM printer driver. Is there a template code for NT4 and Windows 9x? thanks. Tag: Control of default RS-232 pin levels? Tag: 48730
  - 13
    - CreateFile() on NDIS Protocol Driver failes for Regular User Accou Hi, I wrote NDIS Protocol Driver based on NDISUIO DDK sample. It works fine but only under "Administrators" accounts. Under normal user ("Power Users", "Backup Operators") CreateFile() fails with error 5 (access denied). NDISUIO does the same. I called MS Technical Support and the guy there trying to tell me that all communication drivers work only under Admin.??? Does not seem to make any sence. After unsuccessful programmatic attempt to AdjustPriviledges() LogonUser() ImpersonateLoggedonUser()... I have tried to change INF, but with no success (I could be wrong there). Sorry for rather long post, Thanks, Alexei Here how modified NDISUIO.inf it looks like: ;------------------------------------------------------------------------- ; NDISUIO.INF -- NDIS Usermode I/O Driver ; ; Copyright (c) 2000, Microsoft Corporation ;------------------------------------------------------------------------- [version] Signature = "$Windows NT$" Class = NetTrans ClassGUID = {4d36e975-e325-11ce-bfc1-08002be10318} Provider = %Msft% LayoutFile = layout.inf [Manufacturer] %Msft%=MSFT [MSFT] %NDISUIO_Desc%=Install, MS_NDISUIO ;------------------------------------------------------------------------- ; Installation Section ;------------------------------------------------------------------------- [Install] AddReg=Inst_Ndi ;changed by AK to make it visible and removable ;Characteristics=0x28 ; NCF_HIDDEN | NCF_NOT_USER_REMOVABLE Characteristics=0x0 ; NCF_USER_REMOVABLE CopyFiles=CpyFiles_Sys ;added by AK as an attempt to rovide all access to everybody Security="D:(A;;GA;;;WD)" ;------------------------------------------------------------------------- ; Ndi installation support ;------------------------------------------------------------------------- [Inst_Ndi] HKR,Ndi,Service,,"Ndisuio" HKR,Ndi,HelpText,,%NDISUIO_HelpText% HKR, Ndi\Interfaces, UpperRange,, noupper HKR,"Ndi\Interfaces","LowerRange",,"ndis5,ndis4,ndis5_uio" ;added by AK as an attempt to rovide all access to everybody [Inst_Ndi.Security] "D:(A;;GA;;;WD)" ;------------------------------------------------------------------------- ; Service installation support ;------------------------------------------------------------------------- [Install.Services] AddService=Ndisuio,,NDISUIO_Service_Inst [Ndisuio_Service_Inst] DisplayName = %NDISUIO_Desc% ServiceType = 1 ;SERVICE_KERNEL_DRIVER StartType = 3 ;SERVICE_MANUAL_START ErrorControl = 1 ;SERVICE_ERROR_NORMAL ServiceBinary = %12%\ndisuio.sys LoadOrderGroup = NDIS Description = %NDISUIO_Desc% [Install.Remove.Services] DelService=Ndisuio ;------------------------------------------------------------------------- ; Declare Destination Directories for file copy/deletion ;------------------------------------------------------------------------- [DestinationDirs] CpyFiles_Sys = 12 ; DIRID_DRIVERS ;------------------------------------------------------------------------- ; Files to Copy/Delete - Referenced by Install and Remove sections above ;------------------------------------------------------------------------- [CpyFiles_Sys] Ndisuio.sys,,,2 [Strings] Msft = "Microsoft" NDISUIO_Desc = "NDIS Usermode I/O Protocol" NDISUIO_HelpText = "A driver to support user-mode I/O on NDIS devices" Tag: Control of default RS-232 pin levels? Tag: 48724
  - 14
    - NdisMQueryAdapterResources() : resource allocation problem at WinMe Hi, I am stuck with a similar problem (as mentioned below in one of the older postings). Driver works with XP and 2K. Infact it works with WinME installed on PC where I use PCI-Cardbus(Ricoh) controller to insert my cardbus wireless lan controller. It doesn't work with WinME (on IBM Thinkpad A21m laptop). My NdisMQueryAdapterResources() returns only one resource i.e. interrupt. Using debugger command 'pci' I see that BAR seems to be mapped. No difference when I use NdisMPciAssignResources() wrt number of resources but here I get IO enabled in addition to BusMaster and Memory (i.e. control word 0x7 in NdisMPCIAssignResources() against 0x6 in NdisMQueryAdapterResources() . There is one imp print in the debugger in the reboot that follows crash because of pci-bar not getting mapped. It says"VPICD Severe Perf Warning: interrupt #9 is supriousing. Get the owners of the devices on that interrupt to look at their code." This problem exists till I don't shutdown the m/c and start. Device manager shows that 'SCI IRQ used by ACPI bus' is the interrupt that prompts that warning. My device is on interrupt 0xB. Don't know whether this problem is linked to above resource allocation problem. Hi Daum, Found you query in this ng. Did you get the solution for this ? I couldn't find post-followup-message in your posting hence creating a new thread. Went through "Another NDIS, PnP, PCI question" thread in "comp.os.ms-windows.programmer.nt.kernel-mode" which is related problem but changing eeprom contents from 'other controller' to 'ethernet controller' did not help. Thanks, Ashirwad. >From: daum (daum999@yahoo.com) >Subject: [Q] Resource allocation problem at WinMe : physical memory >start .address always 0. >View this article only >Newsgroups: microsoft.public.development.device.drivers >Date: 2003-05-30 10:57:44 PST >Subject : [Q] Resource allocation problem at WinMe : physical memory start >address always 0. >Hello, everyone. >I'm developing CardBus NDIS D/D at WinMe, and i have one problem during >MiniportInitialize. >The problem never occurred at Win2K or WinXp. >It is a problem concerned about resource allocation. >My Card has 2 memory windows and their sizes are 0x40000 and 0x4000. >(I think the memory size was reasonable because it is below 1MB) >After NdisMQueryAdapterResources was called, it returns the status with >NDIS_STATUS_SUCCESS. >But, the start address of the physical memory-CmResourceTypeMemory- was >always 0. >Of course, the memory Length was all OK : 0x40000 and 0x4000. >And, the returned Flags value was 0x0; so, it was non-prefetchable. >Please remind that the problem occurred only at WinMe not Win2K or WinXp. >I'm not sure it will occur at Win98Se. >Thank you for your help in advance. >//DAUM >This is the only article in this thread Tag: Control of default RS-232 pin levels? Tag: 48715
  - 15
    - DrvFillPath Hi When Windows calls my DrvFillPath function of my printer driver, it passes (sometimes) more than 6000 subpaths (MoveEx, Polyline, Polyline, CloseFigure).... so my question now: Where does this come from? Just from one command? Or did the creating application call the FillPath fuction several times? ... 6000 times? Or how's this handled? So, when I'd like to write a test application that creates me that many subpaths and just one DrvFillPath call... what do I have to do? thanks MR Tag: Control of default RS-232 pin levels? Tag: 48711
  - 16
    - Serial Port Driver Hi, I am new to device driver in windows. I was looking into the serial driver source provided with DDK2K. I have included all the necessary files. While building the serial driver by giving the build command , i am getting the following error messages E:\WINDDK\2600.1106\src\kernel\serial>build BUILD: Adding /Y to COPYCMD so xcopy ops won't hang. BUILD: Object root set to: ==> objchk_wxp_x86 BUILD: Compile and Link for i386 BUILD: Loading E:\WINDDK\2600~1.110\build.dat... BUILD: Computing Include file dependencies: BUILD: Examining e:\winddk\2600.1106\src\kernel\serial directory for files to compile. e:\winddk\2600.1106\src\kernel\serial - 16 source files (23,107 lines) BUILD: Saving E:\WINDDK\2600~1.110\build.dat... BUILD: Compiling e:\winddk\2600.1106\src\kernel\serial directory Compiling - error.c for i386 error.c(69) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier Compiling - flush.c for i386 flush.c(73) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier flush.c(76) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier Compiling - immediat.c for i386 immediat.c(103) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier immediat.c(171) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - initunlo.c for i386 initunlo.c(179) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier initunlo.c(385) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier initunlo.c(1113) : error C2065: 'DPFLTR_ERROR_LEVEL' : undeclared identifier initunlo.c(1257) : error C2065: 'DPFLTR_WARNING_LEVEL' : undeclared identifier Compiling - ioctl.c for i386 ioctl.c(619) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - modmflow.c for i386 modmflow.c(90) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier modmflow.c(1610) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier Compiling - openclos.c for i386 openclos.c(137) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier openclos.c(499) : error C2065: 'DPFLTR_ERROR_LEVEL' : undeclared identifier Compiling - qsfile.c for i386 qsfile.c(84) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - read.c for i386 read.c(125) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier read.c(131) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - utils.c for i386 utils.c(328) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier utils.c(1109) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier Compiling - waitmask.c for i386 waitmask.c(96) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier waitmask.c(639) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier Compiling - write.c for i386 write.c(107) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier write.c(113) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - pnp.c for i386 pnp.c(128) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier pnp.c(3141) : error C2065: 'POOL_COLD_ALLOCATION' : undeclared identifier Compiling - registry.c for i386 registry.c(313) : error C2065: 'DPFLTR_TRACE_LEVEL' : undeclared identifier Compiling - legacy.c for i386 legacy.c(86) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - power.c for i386 power.c(101) : error C2065: 'DPFLTR_INFO_LEVEL' : undeclared identifier Compiling - generating code... for i386 BUILD: Compile errors: not linking e:\winddk\2600.1106\src\kernel\serial directo ry BUILD: Done 17 files compiled - 28 Errors - 23107 LPS Can anybody tell me where i am going wrong as i am unable to build the serial driver. Narendra Tag: Control of default RS-232 pin levels? Tag: 48708
  - 17
    - How to program parallel port on Windows 2K/XP? I would write an utility to program parallel port for I2C. The user mode program cannot in/out the I/O port directly on Windows 2K/XP. What should I do to solve the problem? As I konw, I need a kernel mode driver to read/write the I/O port. What should the kernel driver do? and how? Best Regards Jackal Huang Tag: Control of default RS-232 pin levels? Tag: 48707
  - 18
    - How can I enlarge OutputBuffer size? I can the OutputBuffer size through following. irpStack->Parameters.DeviceIoControl.OutputBufferLength; It's size is always 256. How can I enlarge OutputBuffer size? Thank you in advance. -- What do you want to get by Meditation - for forever meeting - Tag: Control of default RS-232 pin levels? Tag: 48704
  - 19
    - ISA NON-Plug and Play WDM Driver I had writen a WDM driver for ISA-device, and it worked good if there is only one device with the system. But the driver can't support more than one device in the same system. The error code is 31. did there anybody ever had the same problem? I use the LogConfig for ISA hardware configuration, and assigned Unknown to driver class. Tag: Control of default RS-232 pin levels? Tag: 48703
  - 20
    - Setting WPA key by OID_802_11_xxx Hello, I am trying to set WPA key using OID_802_11_xx OIDs. I set following OIDs in order OID_802_11_INFRASTRUCTURE_MODE to Ndis802_11Infrastructure OID_802_11_AUTHENTICATION_MODE to Ndis802_11AuthModeWPAPSK OID_802_11_WEP_STATUS to Ndis802_11Encryption2Enabled OID_802_11_ADD_KEY using output of PBKDF2("KT12345678",ssid,ssidlength,4096,256) algorithm (to get 256 bits key from "KT12345678" preshared ASCII key ) OID_802_11_SSID using ssid But there is something wrong with EAPOL 4-way handshake communication. AP stays in authentication phase so I can not get IP address from DHCP server. Do I use wrong key algorithm or my order of OIDs is not correct? I saw that people are sending two OID_802_11_ADD_KEY OIDs after OID_802_11_SSID OID and it works. Could someone tell me at which moment these two OIDs are sent and what is used as WPA key (preshared or output of PBKDF2 algorithm)? I do not understand who is responsible for WPA authentication, client software or wireless driver. If I send WEP key to wireless driver everything is Ok (driver takes key, authentication process is done by driver and I get IP address from AP) but with WPA it is not case. Thanks in advance Tag: Control of default RS-232 pin levels? Tag: 48701
  - 21
    - Custom DeviceIoControl Handling in Stream Minidrive ? (shared memory user - kernel) Hi, I have the screnario as below : I need to have custom IoControl code to communicated with user-mode application, I know how to to it in non-minidriver kernel mode, but how about in stream minidriver ? On kernel streaming driver code: DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE RegisteryPath) { DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = <ouriocontrolhandler> ... ... } Then we have a function: NTSTATUS OurIOControlHandler(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) { irp = IoGetCurrentIrpStackLocation(Irp); controlCode = irpStack->Parameters.DeviceIoControl.UoControlCode; switch (controlCode) { .... <do our work here> } } However, on stream minidrive, DriverEntry( IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath ) { HW_INITIALIZATION_DATA HwInitData; HwInitData.HwReceivePacket = MyReceivePacket; HwInitData.HwCancelPacket = MyCancelPacket; HwInitData.HwRequestTimeoutHandler = MyTimeoutPacket; <continue> ReturnValue = StreamClassRegisterAdapter(DriverObject, RegistryPath, &HwInitData); } So can I l put in the line (or is it safe to do so ?, will it be overwritted) : DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = <ouriocontrolhandler> in stream minidriver ? what <StreamClassRegisterAdapter()> put in for this parameter (IRP_MJ_DEVICE_CONTROL) ? will it overwrite my parameters ? If I want to have my custom IoControl In minidriver, what is the proper way ? Note: Ref: TestCap DDK sample Thank in advance WP Tag: Control of default RS-232 pin levels? Tag: 48697
  - 22
    - passthu problem again. hi, a few days ago i posted a query regarding pasthru IM driver not transmittng larger packets. Mr. Thomas Devine pointed out the article at the following link : http://www.ndis.com/pcakb/KB05280101.htm, but even when i return NDIS_STATUS_NOT_SUPPORTED for OID_TCP_TASK_OFFLOAD in the MPQueryInformation() , the problem persists. any more suggestions ? i have a hunch that this has got something to do with MTU. when i access larger files across the network, the passthru sends the packets of the size of MTU and when i append my own headers, the size gets larger than the MTU and ultimately results in the rejection of the packet. can anybody tell me how i can make the top level network driver to send the packets with size a little less than the MTU so that i can accomodate my headers without exceeding the MTU for NIC ?? thanks in advance. regards. Tag: Control of default RS-232 pin levels? Tag: 48696
  - 23
    - Device_Description of IoGetDmaAdapter Hi all, From the Windows 2000 DDK Help, there is a brief description shows that the "MASTER" member of DEVICE_DESCRIPTION indicates whether the device runs as a busmaster adapter (TRUE) or a slave DMA device (FALSE). Would someone tell me the difference in details. Thanks. Clliman Tag: Control of default RS-232 pin levels? Tag: 48695
  - 24
    - default library for vsnwprintf what is the default library for vsnwprintf function in kernel mode ? linking ntstrsafe.lib gives unresolved external symbol for the above function ie vsnwprintf .... DDK build is 2600.1106 ( Windows XP SP1 DDK) Tag: Control of default RS-232 pin levels? Tag: 48689
  - 25
    - Can not build 16 bit driver uninstallation program I was building a USB driver uninstallation program using win me ddk's 16 bit compiler and linker. Yet it seems that the linker could not build the exe successfully due to the unresolved external "_acrtused". Any one have some comment on this problem? Thanks, Regards, guosheng Tag: Control of default RS-232 pin levels? Tag: 48687

I am controlling an external device (amateur radio) from the RS-232 port, using a specific software. I am using the DTR line for this, but my problem is that this pin goes high by default when I exit this software and return back to Windows XP, which is not what is desirable for the external device.

Is there any way I can set the default RS-232 pin levels/states, when the port is not in use by my device control application? Is this an option in Windows or is there some software that allows me to do this?

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Re: Control of default RS-232 pin levels? by Maxim

Maxim
Thu Jul 22 11:24:46 CDT 2004

There are lots of Win32 functions to control the serial port like
SetCommState.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"Kristinn Andersen" <Kristinn Andersen@discussions.microsoft.com> wrote in
message news:D6B9CD75-A5ED-4130-80D4-9D2F74524754@microsoft.com...
> I am controlling an external device (amateur radio) from the RS-232 port,
using a specific software. I am using the DTR line for this, but my problem is
that this pin goes high by default when I exit this software and return back to
Windows XP, which is not what is desirable for the external device.
>
> Is there any way I can set the default RS-232 pin levels/states, when the
port is not in use by my device control application? Is this an option in
Windows or is there some software that allows me to do this?

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